Alloyed steel
AssigneeVantage Alloys AG
InventorAaron John MIDDLETON
Life of this patent
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Abstract
A vanadium alloyed steel that includes carbon and vanadium and has a steel microstructure with coherent interphase precipitates that have vanadium. A method for producing a vanadium alloyed steel that includes providing a starting steel; heating the starting steel to at least partially austenitise the starting steel; and holding the temperature at 650° C.±200° C. for about 25 minutes or less.
Claims27
A vanadium alloyed steel comprising carbon and vanadium, wherein the steel microstructure comprises coherent interphase precipitates comprising vanadium.
A vanadium alloyed steel according to any preceding claim, wherein the coherent interphase precipitates comprise vanadium carbides.
A vanadium alloyed steel according to any preceding claim, wherein the steel composition comprises at least one or more of (in wt. %):
- about 0.015 or less nitrogen,
- about 1.6 or less molybdenum,
- about 1 or less copper,
- about 1.2 or less silicon,
- about 0.3 or less chromium, and/or
- about 1.6 or less manganese.
A vanadium alloyed steel according to any preceding claim, wherein the steel composition comprises:
- carbon in the range of from about 0.06 to about 1.1.
- vanadium in the range of from about 0.1 to about 1.5,
- about 0.015 or less Nitrogen,
- about 1.6 or less Molybdenum,
- about 1 or less Copper,
- about 1.2 or less Silicon,
- about 0.3 or less Chromium, and
- about 1.6 or less Manganese.
A vanadium alloyed steel according to any preceding claim, in which the steel comprises a ferrite phase and the coherent interphase precipitates are formed in the ferrite phase to form nodular or knotted ferrite.
A vanadium alloyed steel according any preceding claim, wherein the steel comprises a single phase ferritic steel e.g. HSLA, AHSS.
A vanadium alloyed steel according to any preceding claim, wherein the steel comprises a tensile strength in the range of about 360 Mpa to about 2000 Mpa.
A method for preparing a vanadium alloyed steel in accordance with any preceding claim, the method comprising:
- a. providing a starting steel;
- b. heating the starting steel to at least partially austenitise the starting steel;
- c. holding the temperature at 650° C.±200° C. for about 25 mins or less.
Dependencies are inferred from the claim text.